NCERT Class VII Science Solutions: Chapter 4 – Heat Part 2

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Question 4:

Match the following:

  1. Land breeze blows during (a) summer

  2. Sea breeze blows during (b) winter

  3. Dark coloured clothes are preferred during (c) day

  4. Light coloured clothes are preferred during (d) night

Answer:

  1. Land breeze blows during (d) night

  2. Sea breeze blows during (c) day

  3. Dark coloured clothes are preferred during (b) winter

  4. Light coloured clothes are preferred during (a) summer

Question 5:

Discuss why wearing more layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing.

Answer:

The air gets trapped between two layers of warm clothes. Air acts as insulator of heat. This layer prevents our body heat to escape in the surroundings. More layers of thin clothes will allow more air to get trapped and as a result we will not feel cold. So wearing more layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing.

As showing in images is a wearing more layers of clothing du …

Wearing More Layers of Clothing During Winter

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Question 6:

Look at Fig. Mark where the heat is being transferred by conduction, by convection and by radiation.

As showing in images is a transferred by conduction, by conv …

Transferred by Conduction, by Convection and by Radiation

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Answer:

This diagram shows Heat transfer

Diagram of Heat Transfer

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(i) Transfer of heat from burner to pan is by radiation

(ii) Transfer of heat from pan to water is by conduction

(iii) Transfer of heat within water is by convection.